The WHOIS information of a domain name is a collection of many details that are freely accessed using special lookup sites or a command line. The protocol that makes this possible bears the same name and you can effortlessly see the organization through which an Internet domain has been registered, the creation, expiration and last update dates together with the names, postal and email address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific Internet domain. All of this information has to be correct and up-to-date at all times; if it's not the domain registration could be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), this means you must always make sure that the WHOIS details of your domain addresses are legitimate. Updating the WHOIS for several country-code TLDs is limited, so when you register a completely new domain name, you should double-check the info you're submitting.